from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Time based on the rotation of the earth with reference to the background of stars.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Time measured by the apparent diurnal motion of the vernal equinox; approximated by that based on the rotation of the Earth relative to the stars

from the GNU version of the Collaborative International Dictionary of English

  • n. See under Sidereal.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. measured by the diurnal motion of stars


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  • The measurement of time relative to a distant star (instead of solar time that is relative to the sun). It is used in astronomy to predict when a star will be overhead. Due to the rotation of the earth around the sun a sidereal day is slightly less than a solar day. (Wikipedia)

    May 21, 2008